lyan

Most popular questions and responses by lyan
  1. chemisrty

    Q1) A solution of ascorbic acid (C6H8O6, Formula mass = 176 g/mol) is made up by dissolving 80.5 g of ascorbic acid in 210 g of water, and has a density of 1.22 g/mL at 55 oC. Calculate the following: a) the mass percentage of ascorbic acid b) the mole

    asked on January 16, 2012
  2. chemisrty

    Q4) Suppose you prepare 950 mL of a solution by dissolving 100 grams of NaCl in 900 mL of water. Assuming the density of pure water to be 1 g/mL, answer the following questions with regards to this solution: a) What is the mass percent of water in this

    asked on January 16, 2012
  3. chemisrty

    Q5) The reaction for the combustion of propane is as follows: C3H8 + 5O2 ---->>3CO2 + 4H2O 1. If 20.0 g of C3H8 and 20.0 g of O2 are reacted, which is the limiting reactant? 2. How many grams of H2O can be produced? 3. How many grams of the excess reactant

    asked on January 16, 2012
  4. chemisrty

    Q6) A 10 L container contains a mixture of 0.8 g of He and 8 g of Ar at 0 oC. a) (1 pt) Calculate the total pressure of the gas mixture. b) (1 pt) Calculate the partial pressure of each gas in the gas mixture. c) (1 pt) If the initial total pressure of the

    asked on January 21, 2012
  5. chemisrty

    Explain why water (H2O) boils at 100 oC whereas H2S boils at -61 oC, even though sulfur has a higher atomic weight than oxygen.

    asked on January 16, 2012
  6. chemisrty

    Q3) Consider a 10 L container at 0 oC with 40 grams of He and 40 grams of Ar gases: a) Calculate the partial pressure of Ar in the container? b) Calculate the partial pressure of He in the container? c) What is the total pressure of the container?

    asked on January 16, 2012
  7. chemisrty

    Q2) If 0.327 moles of H2S effuses in 462 seconds, how many seconds would it take for the same number of moles of CH3Cl to effuse?

    asked on January 16, 2012